Sewing-machine presser-foot.



A. H. DE VOB.

SEWING MACHINE PRBSSER FOOT,

AFPLIOATION FILED MAR. 27, 1912.

atented @60.16, 1913.

maw@

Y To all 'u1/0m t may concern:

' oi the shank to receive them.

. proper presentation of thread-loops for tliei yl'oop-takerand thereby prevent the skipping tionv carrying at its lower end a tilting fiilcromo-block mounted upon a transverse piv is a perspective view of a presser-foot con- Uniirnn simens *perenni* caries.

ALBERT H. DE VOE, OF YVESTEIELD,V NEW JERSEY, ASSIGNOR T0 THE SINGER" MANUFACTURING COMPANY, A.- CORPORATION GF NEW JERSEY.

SEWING-MACHINE PRESEER-F'OT.

Spccication of Letters '.atent.

Patented Dec. 16, 1913.

Application filed March 27, 1912. Serial No. 686,480.

Be it known that I, ALBERT H. Dn Von, a citizen of the United States, residing at lVestfield, in the county of Union and State of New Jery, have invented certain new and useful `Improvements in Sewing-Machine Presser-Feet, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has vfor its object to provide a sewing machine presser-foot which is adapted to'readily pass over cross-seams in the material and to accommodate itself effectively-perform its function of stripping the fabric from ,the needle to insure the of'stitchesatrthe cross-seam.

. According to the present invention, the presser-foot is constructed with a shank porotal pin and carrying parallel fulcr'umpins upon which :ire mounted independently tilting! 'forward :ind rearward fo0t-plates. The pivotally connected kmembers of tlie-\ presser-foot are preferably" mounted ,withinrand securely guided by the parallel'fside walls `ol a slot formed in the lower end In the accompanyinj.,r drawings, Figure 1 structed .iiiaceordance4 with the present invention, with a section of material to which the same is applied. Fig. 2 is a side eleva tion oi' the presser-foot with the lower povtioii of the shank in section, Fig. 3 a top plan view, partly in section, Fig. It n bottom view, and Fig. 5 a rear end view of the. presser-foot.

As repres^nted in lthe drawing, the presser-foot is constructed with the shank portion l formedwit-h the lateral socket 2 to receive the lower end of the presser-har, :krul with the notch :i for the shank of 'the fastening `,crew/2 The lower portion of the shank is formed intermediate itsl opposite sides with the. paruilel-sided slot. d across which extends the pivotal piu 5, arranged crosswise oi' the presser-foot and therefore ofthe direction of feed of the work. Mountl ed upon the pin within the slot 4 is the 4 tilting' fulcrum-hlock (if, the 'liody portion of E which is of a widthconsiderably less Vthan i.

that of the slot 4, lout is formed with oppositely proiecting bosses 7 whose opposite extremities are distant from each other a space equivale-nt to the width of saidfslot. The hl'oek 6 carries at its ends, and upon opposite sides of thel pin 5the transverse fulcruin-pins 8 and 9 parallel with the pivotal pin 5.

Journaled upon the fnlcrum-pin -8 are thespaced and apertured ears 10 rising froinf the rearward extremity of the forwatdfoob' plate. `-11 formed `lwith the upturned forward the needle-apertures 14 respective needles of atwin-needle Sewing p machine pass; Journaled upon the -fu1 crum-p1n 9 are the spaced apertured ears 15 risingfrom the upper faceof the rearward tilting foot-plate 16 which is formed withl the upwardly inclinedv forward` and!I rearward extremities 17 and 18. The footplates are disposed in tandem arrangement,L

the one having needle-apertures being in advance of the other, und are therefore disposed in a line transverseto the pivotal lfpin 5.

The aggregate -f and the pivotally. connected ears 10 and width of the fuicrum-lilock lov ofthe forward and rearward foot-plates respectively is the saine as that of the slot 4 of thedsliank, as represented particularly in Figs. 3 and 5, thereby restricting the function of therpivotal pins to'aifording supporting .Fulci-a for such members and providing rigid guidingr elements upon the presser-foot shankfor such parts under their operative conditions. The provision ot' the long bearing: hos-ses T upon the fulorum-block intermediate tlie'eurs 10 and 15 of the foot-plates provides n substantial hearing forsuch rocking member and insures durability of its pivotal connection with the shank.y By the illing in oi the slot, --llict'ivccn its side-walls with the part-s suiroululiugF the pivotal pills 5, S and i), the journals of the several tilting' nicnxlicrs are fully protected 'li-oui penetra- Sion of lint and grit 'from the tubries-"opermovement of the foot-plates'for all working conditions, and the upper extremity of the slot 4 is also provided with sufficient clear ance to permit the required movement of y the fulcrum-block- As represented in Fig. 1,- the material a has a folded and stitched cross lap-seam b and a vfolded longitudinal lap-seam c which is partially stitched, the forward extremity thereof 4being represented as it is, delivered from a'lap-seam feller in advance of the presser-foot, and with a folded edge of the upper -ply in cont-act with the guiding li 13 o the foot-plate'll. In the stitching o the longitudinal seam, the material is fed beneath the presser-foot until the crosseseaxn encounters the upturned forward portion 12 of the foot-plate l1, `when the latter istilted upwardly until the edge of thecross-seam b" comes beneath the fulcrum-pin 8, when the l foot-plate reassumes its Vfiat relation with the fabric upon the upper level, asv represented in Fig. 1. In the continuedprogress of the material, the rearward foot-plate 16 performs a like movement, the fulcrum-block 6,

which had been tilted b'y the ascent of the A forward foot-plate to the upper level, regaunng `its initial relation with the presser- .foot shank.

It has heretoforebeen proposed to construct a presser-foot with pivotally mounted work-engaging members, butin none of. such presser-feet as heretofore devised has the skipping of stitches at cross-seams been ef` fectively prevented. lAccording to the present invention, notonl are boththe forward and rearward foot-p atesrendered capable -of independentlyadjusting themselves to 'the face `of the fabric beneath them, so as to hold the fabric adjacent the needles down upon the throat-plate, but the approach and recession of these foot-plates relative to each other, consequent upon the tilting of the ful` crum-block 6 upon its pivotal pin 5, assists inthe prevention of the skipping .of stitches in its action upon the `fabric in the Inovement of the cross-seams in the latter-beneath the 4presser-foot.

In the stitching of certain kinds of heavy fabric, such as canvas -or duck, a mass of lubricant for the needle-thread suchu as wax or paraflin -is sometimes placed lupon the presser-foot around the needle-holes. In thf` stitching operation, the movement of the thread with the needles through the needle apertures causes the adherence thereto of particles of lubricant. In the thicker portions at theHcross-seams, the tilting of a pivoted`foot-plate causes fresh portions of the lubricant to be exposed to the thread, but by 2. A presser-foot comprising a shank-por- I tionA formed intermediate its side-faces with a vertical parallel-sided and open-bottomed Aslot disposed lengthwise of the foot, a .trans- 4the bodily movement as Well as the tilting verse pivotal pin extending crosswise of said.

of said slot and journaled upon said i11,`ful crum-pins Vsustained by said bloc upon opposite sides of and parallel with said pivotal pin, and independent foot-plates arranged in a line parallel with said parallelslot, a fulcrum-block of less widthv than that 'I sided slot and formed with earsembracing l said fulcruin-block and occupying the spaces between the same and the opposite walls of said slot and apertured to receive said fulerum-pins.

In testimony whereof, I have signed my' naine to this specification, in the presence of two subscribing witnesses.

ALBERT H. DE von.

Witnesses:

WM. P. STEWART,

HENRY A. KORNEMANN, Jr. 

